可以使用 Camera2 API 在 Android 上直接录制 MJPEG 格式的视频。

以下是示例代码：

创建 CameraCaptureSession

private void createCameraPreviewSession() {
    try {
        SurfaceTexture texture = mTextureView.getSurfaceTexture();
        assert texture != null;

        // 将默认缓冲区的大小配置为想要的相片大小
        texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());

        // 预览输出 Surface
        Surface surface = new Surface(texture);

        // 创建 CaptureRequest，用于设置预览请求参数
        mPreviewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        mPreviewRequestBuilder.addTarget(surface);

        // 创建 CameraCaptureSession，用于管理预览请求
        mCameraDevice.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback() {

            @Override
            public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
                // 配置成功后，开始预览
                mCaptureSession = cameraCaptureSession;
                updatePreview();
            }

            @Override
            public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {
                Toast.makeText(MainActivity.this, "配置失败", Toast.LENGTH_SHORT).show();
            }
        }, null);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}

配置录制请求

private void startRecording() {
    try {
        setUpMediaRecorder();

        // 创建录制请求
        mPreviewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_RECORD);
        List surfaces = new ArrayList<>();

        // 设置预览 Surface
        SurfaceTexture texture = mTextureView.getSurfaceTexture();
        assert texture != null;
        texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
        Surface previewSurface = new Surface(texture);
        surfaces.add(previewSurface);
        mPreviewRequestBuilder.addTarget(previewSurface);

        // 设置录制 Surface
        Surface recorderSurface = mMediaRecorder.getSurface();
        surfaces.add(recorderSurface);
        mPreviewRequestBuilder.addTarget(recorderSurface);

        // 构建 CaptureSession
        mCameraDevice.createCaptureSession(surfaces, new CameraCaptureSession.StateCallback() {

            @Override
            public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
                mCaptureSession = cameraCaptureSession;
                updatePreview();

                MainActivity.this.runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        // 开始录制
                        mMediaRecorder.start();
                    }
                });
            }

            @Override
            public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession)